Risks and Uncertainties (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Risks and uncertainties
Notes receivable principal amount	$ 1.5
Interest rate on unsettled balances due upon demand (as a percent)	0.00%
Accounts receivable | Customers | Edom Technology
Risks and uncertainties
Concentrations of credit risk (as a percent)	17.00%	25.00%
Accounts receivable | Customers | Arrow Electronics
Risks and uncertainties
Concentrations of credit risk (as a percent)	17.00%	11.00%
Accounts receivable | Customers | Avnet
Risks and uncertainties
Concentrations of credit risk (as a percent)	14.00%	11.00%
Revenue | Edom Technology
Risks and uncertainties
Concentrations of credit risk (as a percent)	20.00%	20.00%	21.00%
Revenue | Avnet
Risks and uncertainties
Concentrations of credit risk (as a percent)	12.00%	12.00%	11.00%
Revenue | Customers | Samsung
Risks and uncertainties
Concentrations of credit risk (as a percent)		12.00%	15.00%
Revenue | Customers | Samsung | High end of range
Risks and uncertainties
Concentrations of credit risk (as a percent)	10.00%